I always go Nature Godlike for Druids for Theme and the fact that it's super easy to self-buff to get the Godlike PL bonus - though generally this is for party builds and not solo builds.
One comment here: if you want to play a Shifter this is probably not a good idea. Giving up helmets means giving up Survivor's Tusks, which is the best Shfiter accessory and the only Soulbound item Shifters can fully benefit from. Shifters also don't constantly use active abilities, which are what benefit from Power Level.
Fair enough. I never play shifters, only nukers/healers.